Cullen is a distinctive boys' name in United States, ranking #1108 in 2025 with 194 recorded births. This places Cullen in the top 8% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2010 with 679 births ranking #413. Since 1996, the popularity has decreased by 50.5%. In 2025, approximately 1 in every 8,805 boys born was named Cullen. FALLING Recent data shows the name is currently falling.